How have individuals, groups, NGOs and governments responded to the humanitarian crisis resulting from this tsunami?

Japan is an industrial nation, that relies on power generated by nuclear reactors. The Fukishima nuclear reactors experienced a meltdown. Efforts to cool the reactors and to contain radioactive contamination is of major concern to the Japanese people and the international community. What has been the response to this disaster?

What implications does the threat of nuclear disaster have for nations looking for alternatives to coal furnaces to generate power?